PDF malware analysis — malicious · a821db2ded49b12e

MALICIOUS

PDF

118.7 KB

MD5: 7b2cf6b0e4619cb82c3e96e716b71b0e SHA-1: 9f1aa61190c81de2a26662cbc1e8720623602bf8 SHA-256: a821db2ded49b12e636de79fdbbcbae4f169a766b8dc076b333efb562334569b

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including a large, comment-padded eval stager. This indicates the script is designed to obfuscate its true functionality, which is likely to download and execute a second-stage payload. The ClamAV detection 'Pdf.Exploit.Agent-36086' further supports the malicious nature of the file.

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36086 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36086
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Large comment-padded JavaScript eval stager high PDF_JS_LARGE_COMMENT_PADDED_EVAL

PDF JavaScript contains a very large stream padded with long random-looking block comments around String.fromCharCode and eval. This is an exploit-kit obfuscation shape used to bury a decoder and recovered stage inside noise, not normal PDF form automation.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `3eced552dd15151c8b81c09edd3b0d2ab1c2ea86a20beb782089571171e1b03a`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627063 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 42 long base64-like blob(s).
`stream_002_off0001d8d2.bin` `ede58a0d5673117dcedd354ae8bf339254cea35592facd2731ffbaf9cafd1185`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D8D2	200 bytes

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